Topic:-Percentages
a percentage is a way of expressing a number as a fraction of a number (per cent meaning "per hundred"). It is often denoted using the percent sign, "%". For example, 45% (read as "forty-five percent") is equal to 45 / 100, or 0.45.
Percentages are used to express how large one quantity is, relative to another quantity. The first quantity usually represents a part of, or a change in, the second quantity, which should be greater than zero.
This percentages help with give you an example as well.
Question:-
How many liters of water must be added to 20 liters of a 24% acid solution to make it 8 % acid.
Answer:-
20 L ,24% acid
needs to be 8% acid
So 24% of 20 is 4.8
Let x be the number of liters of water
(20+x)(8%)=4.8 liters
(20+x)(0.08)=4.8 liters
1.6+0.08x=4.8
0.08x=4.8-1.6
x=40 liters of water is the Answer.
For more help on this ,Please reply me.
a percentage is a way of expressing a number as a fraction of a number (per cent meaning "per hundred"). It is often denoted using the percent sign, "%". For example, 45% (read as "forty-five percent") is equal to 45 / 100, or 0.45.
Percentages are used to express how large one quantity is, relative to another quantity. The first quantity usually represents a part of, or a change in, the second quantity, which should be greater than zero.
This percentages help with give you an example as well.
Question:-
How many liters of water must be added to 20 liters of a 24% acid solution to make it 8 % acid.
Answer:-
20 L ,24% acid
needs to be 8% acid
So 24% of 20 is 4.8
Let x be the number of liters of water
(20+x)(8%)=4.8 liters
(20+x)(0.08)=4.8 liters
1.6+0.08x=4.8
0.08x=4.8-1.6
x=40 liters of water is the Answer.
For more help on this ,Please reply me.
